# Definition talk:Subset/Superset

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In answer to:

- "Please show the source of
**$T$ contains $S$**. According to Book:Paul R. Halmos/Naive Set Theory,**$T$ contains $S$**means**$S \in T$ rather than**$T \supseteq S$**."**

1965: Seth Warner: *Modern Algebra*: "We shall say that a set $E$ is **contained** in a set $F$ or is a **subset** of $F$ if every element of $E$ is also an element of $F$." --prime mover (talk) 01:56, 24 July 2018 (EDT)

- Thank you for your reply. However I found out that in 1965: Seth Warner:
*Modern Algebra*, the use of**contain**sways between**$\ni$**and**$\supseteq$**. So personally I still prefer to use**contain**for**$\ni$**and**include**for $\supseteq$. Just as Book:Paul R. Halmos/Naive Set Theory writes and Element_(mathematics) explains. --DingChao (talk) 03:15, 24 July 2018 (EDT)

- Whatever your preference, this website prefers to document all usages. As the usage of "contains" is not
**universally**understood to mean "$\ni$", it remains appropriate for us to document this terminology. But I have amended the wording. --prime mover (talk) 04:40, 24 July 2018 (EDT)

- Whatever your preference, this website prefers to document all usages. As the usage of "contains" is not